Terratec passive support for GNU/Linux

Terratec offers passive support for
GNU/Linux.
Alsa fully supports this audio device, and several Alsa hackers use it.
It is a recommended choice for people needing good sound quality,
without investing in a professional sound card.

Alsa configuration

Software mixer

Like other USB devices, Terratec audio devices do not have hardware
mixers. You need to create a custom .asoundrc
file, using the softvol plugin, to provide
software level mixing.